/Engine/Source/Runtime/Landscape/Classes/LandscapeComponent.h
Deletes a material layer from the specified edit layer on this component, removing all its data, adjusting other layer's weightmaps if necessary, etc.
void DeleteLayerInternal ( [ULandscapeLayerInfoObject](API\Runtime\Landscape\ULandscapeLayerInfoObject) * LayerInfo, [FLandscapeEditDataInterface](API\Runtime\Landscape\FLandscapeEditDataInterface) & LandscapeEdit, const [FGuid](API\Runtime\Core\Misc\FGuid) & InEditLayerGuid )